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3. TROUBLE SHOOTING
3.5 GSM, WCDMA, LTE PART
3.5.1 GSM RF PART
Image
Checking Flow
Circuit Diagram
TP3( 1.8V)
Check other related RF path
TP2(Vbat)
Main
Bot
NO
YES
TP1(3.4V -4.3V)
Check TP1 is it 3.4v-4.3v
START
Check TP3 is it 1.8V
Check TP2 is it Vbat?
Rework R1543,
TP1/2power=Vbat:
3.4V-4.3V
YES
YES
NO
TP1
TP2
Checking GSM PAM DC Power Circuit
TP3
29
Содержание LM-X120HM
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